Oatey 43795 Solvent Weld White PVC Saddle Tee Kit, 4-Inch X 4-Inch

worked great to tap a new drain line in to an existing one. easy install and significantly less digging than splicing a whole "wye" into the existing. I primed and glued all around the contacting surface of both the new and existing pipe and caulked inside, hopefully it doesn't leak and let roots grow in but for now, im impressed.

Didn't like! poor fitment

I purchased this saddle tee to tap into an inside perimeter foundation drain when I was building a radon mitigation system. I had to cut a hole in our basement concrete floor and dig down a little over three feet to reach a short piece of 4" drainage PVC used in a step-down in that drain line, and the idea of trying to cut and insert a glue-in tee just wasn't very appealing. Spending more time hanging upside down in that hole wasn't my first choice for fun things to do, plus there was really no way to move either end of that PVC pipe after cutting through it, so using a glue-in tee would have resulted in having the pipe only half engaged in the two ends of the tee after centering it. This device was the ideal answer. I cut a hole in the top of the PVC, placed sealant around the holr, and then put this saddle fitting in place. It's really made for schedule 40 PVC, but it worked just fine the this drain line. I guess I still had to hang upside down in the hole, but it worked out great. And, best of all, our basement radon level dropped to outdoor ambient levels after firing up the fan in the attic.

This was a lifesaver for adding an RV drain to our existing septic system. Instead of needing to dig up a bunch of pipe to install a regular Tee, I only had to dig to the place I intended to tap into it. After deciding where I wanted it, I marked the hole I would need to cut with a marker, then cut it out with a router. The Tee is made from flexible plastic, so that it can tap into either 4" sewer pipe or 4" schedule 40 DWV, flexing to fit either diameter tightly as you tighten the nuts. The flange will fit over 4" schedule 40 DWV, but it also fit perfectly over the outside of a 4" sewer elbow fitting, as shown in the picture. I highly recommend this. No idea why they don't stock these at hardware stores.

worked just fine don't know how long it will last under ground